电子信息专业英语 作者 杨泽清 Unit16.pptVIP

* Unit 16 A. Text Optical Communications 在线教务辅导网： 教材其余课件及动画素材请查阅在线教务辅导网 QQ:349134187 或者直接输入下面地址： New Words and Expressions indicator [5indikei] n. 标志,指示(器) dispersion [dis5pE:FEn] n. 散布,散射 emission [i5miFEn] n. 散发,发射 chirp [tFE:p] n. 喳喳声, 唧唧声 boost [bu:st] v. n. 推进 arena [E5ri:nE] n. 竞技场, 舞台 trunking [5trQNkiN] n. 中继 impose [im5pEuz] v. 征税,利用 abnormal [Ab5nC:mEl] adj. 反常的,变态的 backed by 有…支持的 Technical Terms multiple multiplex 多路复用 multi-mode system 多模系统 single-mode system 单模系统 Dispersion Shift Fiber 色散位移光纤 O/E conversion ( Optical/Electronic conversion ) 光/电转换 NZ-DSF ( the Non-zero Dispersion Shift Fiber ) 非零色散位移光纤 LEAF ( the Large Effective Area Fiber ) 大有效面积光纤 LDSF ( the Low Dispersion Slop Fiber ) 低色散斜率光纤 ADF ( the Abnormal Dispersion Fiber ) 反常色散光纤 Notes 1. A main indicator of the technological advancement of optical communication in the past 30 years is the annual growth in transmission capacity, which is physically reflected in the progress made three aspects: the optical appliance, multiple multiplexing modes and novel optical network protocols. 过去30年光通信技术发展的主要标志是传输容量的逐年增长， 技术发展主要表现在光器件、多种复用方式和新颖的光网络协议。 该句为复合句，其主句的主干结构是 A main indicator … is the annual growth… ; which is physically reflected… 是非限制性定语从句。 2. The zero dispersion point of the ordinary single-mode fiber is in the neighborhood of 1.31μm, whereas DSF has shifted the point from 1.31μm to 1.55μm, thus effective solving the dispersion problem of the 1.55μm system. 普通单模光纤的零色散点在1.31μm附近，色散位移光纤将零色散点从1.31μm移到1.55μm，有效地解决了1.55μm光通信系统的色散问题。 whereas 是并列连句, 所连接的并列句, 表示一种转折关系；前一分句是一个系表结构 The point …is …in the neighborhood; 后一分句中的 thus … system 是现在分词短语